Hello every body,

 I have PLC CPU 319 PN/DP and i try to access the unit but i couldn't but i know it's IP address and when i search for the unit in the network i didn't find it .

when i try to upload HW configuration i found it but when i try to upload ,it gives me message that it couldn't access the unit .

for my thinking that the unit is protected from accessing ..

my question is : how to access on  the program of  this CPU 

hi AHMED,

try to connect directly to your CPU/CP. It seems, that something in the network, e.g. a switch, is blocking the access to your device. 

hope this helps, 

regards,